Historical clue formulations

• Personal ad abbr. — 2022-07-31
• Inits. in some personals, once — 2019-03-26
• Dating site initialism — 2015-02-28
• Match.com abbr. — 2014-09-19
• Personal letters — 2013-05-09
• Personal ad abbr. — 2012-12-27
• Abbr. in personals — 2009-09-07
• Personal ad abbr. — 2008-09-07
• Abbr. in personal ads — 2007-10-26
• Abbr. in a personals ad — 2006-10-13
• Woman in a personal ad: Abbr. — 2006-02-05
• Personal ad abbr. — 2002-12-07